-50.34% is the change from 437 to 217
Calculation steps:
[( 217 - 437 ) ÷ 437] x 100 = -50.34%
Formula
Percentage change = [(217 - 437) / 437] x 100
Subtract the new number by the original number
217 - 437 = -220
-220 ÷ 437 = -0.5034324942791762
-0.5034324942791762 x 100 = -50.34%